Means for attaching crowns to roots of teeth.



Yo. A.'DAv1s. .MEANS PQR ATTAGHING`A GRoWNs To ROOTS 0F 'TEBTH- QN FILED om". 2s, 1907.

APPLIOATI CHARLES A. DAVIS, 0F PASADENA, CALIFORNIA.

MENS FOR ATTACHENG CROWNS T0 ROGTS 0F TEETH.

ne., senseo.

Specification of Letters Eatent.

retest-sc sans ieee.

Application filed Getcber 23, 1907, Soria). No. 898,829.

To all whom t may concern:

le it known that l, CHARLES A. Devis, a citizen oi the United States, residing at Pasadana, in the county oi Los Angeles and State ci California, have invented certain new and useful Improvements in Means for Attach ing Crowns to Roots of Teeth; and l do hereby declare the following to be a full, clear, and exact description 'of the invention,

such as will enable others skilled in the art to which it appertains to make and. use the to the roots of teeth and so arranged that access may be readily had to the canal cavity of the root, in the event of it being desired to treat the root, andcomprises essentially a hollow tubular pin adapted to 'he securely anchored in alinenient with the root canal,

'and being slightly inclined, in order to allow the cutting edge of the crown oi the tooth to he in axial alinement with the root canal and the palatal cavity in the side ci the crown is so arranged that an instrument may be con veniently inserted and 'passed through the angular passageway in the pin.

Heretofore attempts have been made to utilize tubular pins for anchoring crowns to the roots oi' teeth and in all instances the crown has been cut away throwing thehite of the crown at one side ci the axial center of the root, this oeing necessary in such cases in order to have access to the straight tubular in so adjusted, and which is an objection, as t e usual pressure coming upon an abnorrnal placed crown has the tendency to loosen Y the saine from the pin or root.

Another feature oi the present invention comprises an angular tubular join designed to connect 'a crown to the root ci a tooth7 the opening in one end of the pin which is positioned in the crown being daring, in order to facilitate the insertion. ci a drill or other instrument for the treatment or' excavation of the root canal.

A. still further feature of the resent invention comprises a tubular angu ar pin having a lateral projection thereon, designed to hold the pin from a rotary movement when cemented upon the crown and root.

The invention comprises various details i in ord of construction which will he hereinafter fully described and then specifically d ened in the appended claims.

i `llustrate my invention in the accomnan drawings, in whichz* Figure l a perspective view oi a tooth crown provided with my improvement. Fig. 2 is a-central vertical section of the crown and root, showing the means einployed in treating the root. Fig. 3 is a central vertical section of the hollow tooth pin. Fig.' Ll is a perspective view ci the pin, and Fig. 5 is a top plan view of the crown with the pin removed.

Reference new being had to the details of the drawings hy letter, A designates theroot ci a tc-oth having the usual canal cavity B, and C is a tuloular pin which is lient at C at a slight angle and the outer surface of said pin is provided with grooves or threads whereby the saine may he securely held by cement to the root ci the tooth.

D designates the crown ci a tooth, one end ci which, where it is to join the end oi the root,` is preferably recessed slightly to receive a laterally projecting lug E upon the pin, which serves toy prevent the crown from hav1 nig an axial movement independent of the pin. Said crown has a recess ll which inclnes 'slightly to conform to the inclination ci the portion oi the pin which is seated therein, and said recess has an opening F through the wall thereof and through which access may he had to said tubular pin. lt will he noted that the opening A into the end of the pin, which engages said crown, is flarr toiacilitate the insertion ci an instrument into the opening extending through the pin, whereby access may loe had to the canal cavity for the purpose oi' treating the saine, if desired. in adjusting the pin, one end of the 'pinis iirst inserted in thev recess in the crown in the manner shown and the other end of the pin inserted in the canal cavit oi the root and secnrelv cemented and anchored, which ceinent engages the threads or grooves in the circurnlerence oi the pin.

The laterally projecting luv u )on the pin engaging the recess in' the en( oi the crown and securely cemented therein will serve to prevent the pin and crown l'roin having inden pendent axial movements. filter the cenient is thoroughly set, the entrance into the tubular pin may lbe closed hy any suitabl lling, which niay he readily removed by proper instruments Whenever it may be desired to have access to the cavity of the root llforitreatment or for any other purpose.

,-. It will be noted that, by the provision of an f angular, tubular pin for. connecting crowns to the roots of teeth, the minute Flialole instrument may be readily insertecthrough the oyening in the crown and. passed into and. t ough. the tubular pin Without any interference with the outtingedge of the crown which, at all times, is held in its natural po siton with itsend in fiel alineinent with the root canal. It will also he noted that the al'atine opening in said crown, as showny at is larger internalln)7 than at its mouth,

v for the pur ose that the cavity may be more a crown to the root oi a tooth, the opening in the crown engaging end of the pin being flair1m ing, as set fertili.

3.v An angular, tubular pin for connecting a crown to the .root of a tooth, said in hav# ing la lateral projection and adapten to hold signature inthe presenee of witnesses.'

/eeneoo a crown from having a movement inde'oen-u ent ol. the pin when held to the root of a tooth, as set forth.

fl. ln combination with the root of a tooth, an angular, tubiailarapiri, one end oi .which is v seated in the canal cavity of l hex/'ing a cavity in which 'll pin is positioned, said crown li ,ing ia the wall tliereoi2 in .reto passageway through said p preventing the crown from having an axial movement independent oi the pin, as set forth. f

5. ln combination With the root ol' tooth,

an angular, tubular pin having a portion thereof seated in the canal of the root and rovicled With a lateral projeetion, a crown aving an inclined cavity therein for the reception of one end of said pin a recess the reception of said lateral proj@ ting portion of the pin, the Palatine surface nig an opening in registrat passageway through sans :ein

lo testnnony whereof .i i if; my

HARLES fr. DAVE.

itnessesz A.lJ.,HoUo-n, FRANKMN H. Bones. 

